Is something wrong with my body?

I am so frustrated! I gained 5 pounds in 2 days! Every time I eat food, my stomach expands enormously like a balloon! I feel so embarrassed to go out and eat with my friends or even by myself because every time I eat a meal, my stomach gets so big! In the mornings when I wake up, my stomach is flat as an iron! Why do I gain weight so easily? I am sad? :/
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Honestly, I am not even exaggerating! People that don't know me think I am like 5 months pregnant every time after I eat a meal, it gets that big! And in the morning it is flat! Ugh, help please? And I don't like the fact that I gain so much weight so easily!
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Has this happened to any other girls before? Is it normal? If so, do you know what caused it and how it can be treated?
Is something wrong with my body?
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